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i dont understand how to solve it. its been a long time since i did algebra and i cant remember how to do it

waheguru

5 years ago

Lets Do this step by step
Do you know parallel and perpendicular lines ?
And how the slope change in relation to each

waheguru

5 years ago

When a line is parallel to a line then the slope stays the same |dw:1343935655688:dw|
Here as you can see the lines will never meet because the slopes are the same althought the y intercepts can be different, even if the slopes were 2 for the first line and 1.9 for the second they wound not be parallel
*When a line is parallel to another line the slope is the same
Perpendicular lines intersect at 90 degrees and for that to happend the slope must be the opposite reciprocal so if a line is parallel to 1/2, we find the reciprocal which is 2/1 and change it from a positive to negative so it becomes -2/1
Do you get this much

waheguru

5 years ago

Sorry I meant to say when a line is perpendicular for the second paragraph

anonymous

5 years ago

yes

anonymous

5 years ago

oh okay

waheguru

5 years ago

3x + y = 7
Here you need to find the equation of the line which is perpendicular to this equation so right of the bat we need to make this in to y=mx+b format right so we can get the slope
Do you know how to change it in to y=mx+b format?

waheguru

5 years ago

Convert 3x + y = 7 in to y=mx+b @drakelovermel

anonymous

5 years ago

i sorta forgot. please refresh my memory

waheguru

5 years ago

This is algebra
3x + y = 7
you need to isolate y amd move everythin g on the right side
y=-3x+7

waheguru

5 years ago

Do you understand

anonymous

5 years ago

yes

waheguru

5 years ago

Now what is the perpendicular slope to -3x?

anonymous

5 years ago

was it y=3x+7

waheguru

5 years ago

No we moved it so it became negative

anonymous

5 years ago

ohh okay i got you

waheguru

5 years ago

So...

anonymous

5 years ago

okay so whats to learn next?

waheguru

5 years ago

What is the perpendicular slope to -3x.

anonymous

5 years ago

heyy thanks for the help! you where very helpful but i have to go eat and my mom is calling me soo im soo srry but i got to go. but thanks!!!